docs: def addGeneTargetingReagent(
              self, reagent_id, reagent_label, reagent_type, gene_id,
              description=None):
          """
          Here, a gene-targeting reagent is added.
          The actual targets of this reagent should be added separately.
          :param reagent_id:
          :param reagent_label:
          :param reagent_type:
  
          :return:
  
          """
  
          # TODO add default type to reagent_type
          self.model.addIndividualToGraph(
              reagent_id, reagent_label, reagent_type, description)
  
          self.graph.addTriple(reagent_id, self.globaltt['targets_gene'], gene_id)
  
          return